BOISE MOUNTAINS — * WHAT...Flash flooding and debris flows caused by excessive rainfall are possible over the Crooked burn scar and Wapiti burn scar. Total rainfall up to 1 inch is possible on the burn scars.
* WHERE...Wapiti and Crooked burn scars in southwest Idaho including Highway 21 between Grandjean and Banner Summit.
* WHEN...From 6 PM MDT this evening through Friday morning.
* IMPACTS...Heavy rainfall over the Crooked and Wapiti burn scars which could trigger flash flooding or debris flows. Residents near the Crooked and Wapiti burn scar should prepare for potential debris flow. Mud and debris could impact Highway 21 between Grandjean and Banner Summit.
* ADDITIONAL DETAILS... - National Weather Service Meteorologists are forecasting heavy rainfall over the Crooked and Wapiti burn scar, which may lead to flash flooding and debris flows. - Some locations that may experience flash flooding include... Grandjean and Highway 21 between Grandjean and Banner Summit. - https://www.weather.gov/safety/flood
Flooding in Boise Mountains can cut off roads with little warning, damage homes near low-lying areas, and disrupt power and water service. Even a few inches of moving water can carry away a vehicle.
This report is based on information from NWS, monitored by Alert USA's verified emergency feed.
Alert USA anticipates a high chance of travel disruptions, elevated property risk in low-lying areas, and possible power outages while the event is active.
Recommended steps: avoid flooded roads — turn around, don't drown; move to higher ground if you are in a low-lying area; charge phones and prepare for power loss; check on family and neighbors.
Alert USA is tracking this flood event and will update this report as verified information becomes available.
Verified by Alert USA • NWS